This quiz works best with JavaScript enabled. Home > Class 11 > Class 11 Physics (Part Ii) Chapter 17 Waves – Quiz 21 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 11 Physics (Part Ii) Chapter 17 Waves Quiz 21 (25 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. True or False:Black body radiation is independent of the material of the body. A) True. B) False. C) Partially true. D) Depends on the temperature. Show Answer Correct Answer: A) True. 2. Diffracted waves spread out ..... if the gap is wider. A) More. B) Less. C) The same. D) None of the above. Show Answer Correct Answer: B) Less. 3. Name two uses of Ultraviolet radiation A) Security ink and tanning lamps. B) Communications and cooking. C) Cooking and tanning lamps. D) Fibre optic cables and medical scans. Show Answer Correct Answer: A) Security ink and tanning lamps. 4. The lowest part of a transverse wave are the A) Crests. B) Troughs. C) Wave points. D) Low nodules. Show Answer Correct Answer: B) Troughs. 5. Why can dogs hear frequencies above the range of human hearing? A) Because they have a different ear structure. B) Because they have more sensitive ears. C) Because they have better ears. D) Because they have a higher pitch. Show Answer Correct Answer: D) Because they have a higher pitch. 6. What is the relationship between wavelength and frequency in electromagnetic waves? A) Wavelength and frequency have no relationship in electromagnetic waves. B) Wavelength and frequency are inversely related in electromagnetic waves. C) Wavelength and frequency are directly related in electromagnetic waves. D) Increasing frequency leads to longer wavelengths in electromagnetic waves. Show Answer Correct Answer: B) Wavelength and frequency are inversely related in electromagnetic waves. 7. Sound beyond 20, 000 Hz is called A) Infrasound. B) Ultrasound. C) Supersound. D) Megasound. Show Answer Correct Answer: B) Ultrasound. 8. What is measured from crest to crest or trough to trough? A) Frequency. B) Amplitude. C) Wavelength. D) Origin. Show Answer Correct Answer: C) Wavelength. 9. What do we call sound waves below 20 Hz? A) Ultrasound. B) Infrasound. C) Loud sounds. D) Quiet sounds. Show Answer Correct Answer: B) Infrasound. 10. The number of wave cycles in a given unit of time is called the wave ..... A) Frequency. B) Amplitude. C) Wave Length. D) Wave Height. Show Answer Correct Answer: A) Frequency. 11. Which of the following is sound unable to travel through? A) Air. B) Water. C) Gas. D) Vacuum / Space. Show Answer Correct Answer: D) Vacuum / Space. 12. The maximum displacement in the positive direction, or highest point, on a transverse wave is: A) The crest. B) The trough. C) The top. D) The coast. Show Answer Correct Answer: A) The crest. 13. It is the lowest point of a wave. A) Crest. B) Amplitude. C) Wavelength. D) Trough. Show Answer Correct Answer: D) Trough. 14. States that the force acting on a spring is directly proportional to the amount the spring is stretched A) Law of reflection. B) Node. C) Hooke's law. D) Doppler effect. Show Answer Correct Answer: C) Hooke's law. 15. What is the speed of sound in air approximately? A) 330 m/s. B) 1000 m/s. C) 250 m/s. D) 500 m/s. Show Answer Correct Answer: A) 330 m/s. 16. What is the wave equation? A) Wave speed = frequency / wavelength. B) Wave speed = frequency x wavelength. C) Wave speed = wavelength / frequency. D) None of the above. Show Answer Correct Answer: B) Wave speed = frequency x wavelength. 17. The speed of a wave is equal to: A) The amplitude divided by the frequency. B) The wavelength multiplied by the frequency. C) The amplitude multiplied by the frequency. D) The wavelength divided by the frequency. Show Answer Correct Answer: B) The wavelength multiplied by the frequency. 18. What happens to the speed of light waves when they pass from air (less optically dense) to glass (more optically dense)? A) The speed decreases. B) The speed increases. C) The speed remains constant. D) The speed becomes zero. Show Answer Correct Answer: A) The speed decreases. 19. If a wave has a period of (T) of 0.0167 sec, then it's frequency is ..... A) .0167 HZ. B) Diurnal. C) 60 Hz. D) 20 m. Show Answer Correct Answer: C) 60 Hz. 20. Put the following in the order of wavelength, starting with the longest A) Ultraviolet, X-rays, gamma rays. B) X-rays, gamma rays, Ultraviolet. C) Gamma rays, X-rays, ultraviolet. D) Ultraviolet, light, infrared. Show Answer Correct Answer: A) Ultraviolet, X-rays, gamma rays. 21. Wave number A) K=2 $\pi$ $\lambda$. B) $\frac{\lambda}{2\pi}$. C) K= $\frac{\pi}{\lambda}$. D) K= $\frac{2\pi}{\lambda}$. Show Answer Correct Answer: D) K= $\frac{2\pi}{\lambda}$. 22. Refraction occurs because ..... A) Light is bent by gravity. B) Surfaces are bent and bend the light. C) We do not know. D) The light changes speed as it enters a new medium. Show Answer Correct Answer: D) The light changes speed as it enters a new medium. 23. Which of the following statements best describes the Doppler Effect? A) It causes waves to bend around obstacles. B) It changes the color of light waves. C) All the above. D) None of the above. Show Answer Correct Answer: B) It changes the color of light waves. 24. A pendulum has oscillated 80 times in 16 seconds. A) The frequency is 5 Hz. B) The frequency is 0.2 Hz. C) The frequency is 4 Hz. D) The frequency is 0.4 Hz. Show Answer Correct Answer: A) The frequency is 5 Hz. 25. What are the three primary colours of light? A) Red, White and Blue. B) Red, Yellow and Blue. C) Red, Green and Blue. D) Red, Magenta and Blue. Show Answer Correct Answer: C) Red, Green and Blue. ← PreviousNext →Related QuizzesClass 11 Physics (Part Ii) Chapter 17 Waves Quiz 1Class 11 Physics (Part Ii) Chapter 17 Waves Quiz 2Class 11 Physics (Part Ii) Chapter 17 Waves Quiz 3Class 11 Physics (Part Ii) Chapter 17 Waves Quiz 4Class 11 Physics (Part Ii) Chapter 17 Waves Quiz 5Class 11 Physics (Part Ii) Chapter 17 Waves Quiz 6Class 11 Physics (Part Ii) Chapter 17 Waves Quiz 7Class 11 Physics (Part Ii) Chapter 17 Waves Quiz 8Class 11 Physics (Part Ii) Chapter 17 Waves Quiz 9Class 11 Physics (Part Ii) Chapter 17 Waves Quiz 10 🏠 Back to Homepage 📘 Download PDF Books 📕 Premium PDF Books